CVE-2026-73278 json
Gitea WebAuthn bypass during OAuth and OIDC sign-in
published 2mo ago modified 28d ago also BIT-gitea-2026-73278 , EUVD-2026-93940 , GHSA-92j2-6qcg-c28c
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 40%
- public exploits
- 0
- none known
Summary
Gitea's OAuth2 and OpenID Connect sign-in paths do not require a WebAuthn challenge when WebAuthn is the account's only configured second factor. A party able to authenticate through the affected external identity flow can obtain a full session without the passkey verification enforced during password login. One affected path can also persist an external identity link, extending the compromise beyond the initial session; accounts with TOTP configured are outside the reported WebAuthn-only scenario.
Patch / fix
- bitnami gitea 1.27.2
- gitea gitea 1.27.2
- github.com/go-gitea/gitea#38805 pull request
- github.com/go-gitea/gitea#38810 pull request
- github.com/go-gitea/gitea/releases/tag/v1.27.2 release
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- last mo.
Exploit prediction
0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | gitea | >=1.16.0, <1.27.2 |
1.27.2 |
Affected products
- Gitea Gitea
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
github.com
/go-gitea/gitea/pull/38805
patch
-
github.com
/go-gitea/gitea/pull/38810
patch
-
github.com
/go-gitea/gitea/security/advisories/GHSA-92j2-6qcg-c28c
vendor-advisory, advisory
-
blog.gitea.com
/release-of-1.27.2/
release-notes, article
-
github.com
/go-gitea/gitea/releases/tag/v1.27.2
release-notes, article
-
nvd.nist.gov
/vuln/detail/CVE-2026-73278
web
Sources
- CVE List CVE-2026-73278
- NVD CVE-2026-73278
- OSV BIT-gitea-2026-73278
- Maintainer advisory GHSA-92j2-6qcg-c28c
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of go-gitea/gitea published their own advisory on GitHub. Reviewed sources take precedence over it.